Artificial knee joint



FIG. 1 is a perspective view of an artificial knee joint showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side perspective view thereof;

FIG. 5 is a right side perspective view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a rear perspective view thereof. 

The ornamental design for an artificial knee joint, as shown and described. 